Avoid runtime warning by only calling gdk_window_resize when calltip window set to not be NULL.
Avoid runtime warning by only calling gdk_window_resize when calltip window
set to not be NULL.

rhaberkorn/scintilla-mirror,rhaberkorn/scintilla-mirror,rhaberkorn/scintilla-mirror,rhaberkorn/scintilla-mirror,rhaberkorn/scintilla-mirror,rhaberkorn/scintilla-mirror,rhaberkorn/scintilla-mirror,rhaberkorn/scintilla-mirror